On Sunday 19 March 2006 19:42, Mark Watson wrote:
> First a bit of background. About a year and a half ago I built myself a PVR
> using a Cypress FX2 to feed an mpeg TS from a digibox. This has been
> working great except the FX2 disconnects every few weeks (possibly heat
> related, I've just fitted a heatsink...). I'm finally trying to get to the
> bottom of why it crashes when it disconnects, with the help of kgdb. I can
> generally reproduce this crash by unplugging with vdr is running.
>> My driver source is available at:
>http://www.scrameta.net/skympeg/dvb_skympeg.c (Feeds a whole transponder
> from an already configured FX2, filters a bit and pumps it into the kernel
> dvb demux)
>http://www.scrameta.net/skympeg/dvb_skympeg_fe.c (Just a stub for fake
> tuning to allow vdr to work)
>> In dvb_skympeg.c my cleanup code, called on usb disconnect, does something
> like:
> dev->dvb_demux.dmx.close(&dev->dvb_demux.dmx);
> dev->dvb_demux.dmx.remove_frontend(&dev->dvb_demux.dmx,
> &dev->fe_hw); dev->dvb_demux.dmx.remove_frontend(&dev->dvb_demux.dmx,
> &dev->fe_mem); err("dvb_demux...");
>> dvb_dmxdev_release(&dev->dmxdev);
> dvb_dmx_release(&dev->dvb_demux);
> err("dvb_dmx_release");
>> if (dev->dvb_frontend) dvb_unregister_frontend(dev->dvb_frontend);
> dev->dvb_frontend = 0;
> err("dvb_unregister_frontend");
>> dvb_unregister_adapter(&dev->adapter);
> err("dvb_unregister_adapter");
>> The problem occurs after it has logged "dvb_dmx_release". The crash is in
> dmxdev.c:983 (in 2.6.15.6 official) in dvb_demux_poll, as called by vdr.
> Now I can see why dmxdevfilter is invalid, since its been freed, but I'm
> not sure how to avoid this since I already called dvb_dmxdev_release. Do I
> need to check no-one is using the device before calling dvb_dmxdev_release?
> I do have an open count on my device (though I think thats for USB?), but
> no-one has it open. Sorry, not got much experience with device drivers on
> linux...
>> Hope someone can help.
>> Thanks,
>> Mark
>> _______________________________________________
> linux-dvb mailing list
>linux-dvb at linuxtv.org>http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
Please help! Do I need to provide more information? I only really want to know
how I should be using the dvb_dmx_release. Presumably I need to check it is
not being used before calling, but can't work out what.
Thanks,
Mark